Doubt in JAVA Programming-Use of GOTO?

Question

I'm new to JAVA. I found JAVA very strange at first as I was used to much of BASIC programming. Well, keeping all those aside, this is my very 5th program in JAVA. It is a program which inputs a number(from 1-10) and displays it's multiplication table. But when the execution is over, I want the program to repeat itself , in other words, an alternative to 'GOTO' function.
This is my program:
// A program to write tables
import java.io.*;
public class tables
    public static void main(String args[])throws IOException
        int a=0;//Initializing variables
        System.out.println("LEARN YOUR TABLES.");
        System.out.println("With this program, you can learn tables from 1-10");
        System.out.println("So what are you waiting for? Enter the number you want and hit ENTER");
        InputStreamReader x=new InputStreamReader(System.in);//Input Statement
        BufferedReader in=new BufferedReader(x);
        a=Integer.parseInt(in.readLine());//Store user input in "a"
        switch (a)
            case 1://For 1's tables
            System.out.println("WHAT?!?!?! DONT KNOW TABLES OF 1!!!! ");
             break;
            case 2://For 2's tables
            int c;//Variables for this case
            for (c=1;c<=10;c++)
            System.out.println(2+" * "+c+" = "+ 2*c);
            break;
            case 3://For 3's tables
            int d=3;
            int e=1;
            do
                System.out.println(3+" * "+e+" = "+d);
                e++;
                d=3*e;
            }while (e<=10);
            break;
            case 4://For 4's tables
            int f,g=1;
            while (g<=10)
                f=4*g;
                g++;
                System.out.println(4 +" * "+g+" = "+f);
            break;
            case 5:
            int h;
            for (h=1;h<=10;h++)
            System.out.println(5+" * "+h+" = "+5*h);
            break;
            default:
            System.out.println("I'm sorry ladies and gentlemen but multiplication");
            System.out.println("for this number is still under construction and I");
            System.out.println("think that it will always be so..............");
}After the table is executed, I want the program to begin from first. How can that be done?

Answer 1

Hello dinodig,
some hints that I hope are helpful:
1a. Do not put your whole code in your main method, which is only the entry point to your program. I usually call the main class constructor in main(), from where the object oriented programming can start. Put the code in a learningTables() method that you can call every time you want to run that code. 1b. Read on from here!
2. Go through the [java tutorials|http://download-llnw.oracle.com/javase/tutorial/java/TOC.html] from the beginning to the end. Thatll give you quite a first view of how the language works. Especially read the first chapter, "Object-Oriented Programming Concepts". Seems like a lot, but it really isnt. The ratio of benefit / reading is a really high one.
3. GOTO is an abomination. It leads to ["spaghetti code"|http://en.wikipedia.org/wiki/Spaghetti_code]. Please dont feel insulted by this, it is a horrible thing. I. e. Im whipping GOTO here, not you. ;-)
Too slow for sure. Well, Ive got to get my post count up or Mum will beat me again. :-)
Have fun!